Blow Molding
12 조회수
HDPE '2079851475616104457 container melt fracture
문제 현상
The parison surface is rough like sharkskin, and the container surface becomes rough accordingly.
원인 분석
Exit shear stress exceeds the critical value; low mold temperature and fast extrusion speed; more obvious when the regrind ratio is high.
해결 방법
①Change the extrusion pressure/speed; ②adjust the back pressure; ③reduce the regrind ratio; ④check the head heating band; ⑤increase the die temperature.
핵심 요약
For rough parison, first adjust the pressure-temperature combination.
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